Cutting-chain



C. J. KIENZLE.

CUTTING CHAIN. APPLICATION FILED MAY 31 1920.-

2 SHEETSSHEET I.

WITNESSES; 1 V [NVENTO wh if BY 1% W 1 44w ATTORNEY C. J. KIENZLE.

CUTTING CHAIN.

APPLICATION FILED MAY 3. 1920.

19,1921. 2 SHEETS-SHEET 2.

Patented Apr.

NITED STATES PATENT OFFICE.

CHARLES J. KIENZLE, OF COLUMBUS, OHIO, ASSIGNOB TO THE JEFFREY MANUFAC- I TUBING COMPANY, OF COLUMBUS, OHIO, A. CORPORATION OF OHIO. I

CUTTING-CHAIN.

Specification of Letters Patent.

Application filed May 3, 1920. Serial No. 378,517.

The especial object of this invention is to provide a chain of strong and simple construction comprising means for securely holding the renewable cutter bits during operation of the machine which will permit of expeditious and convenient replacement and adjustment of said bits.

The means by which I attain this object are fully set forth in the following specification and illustrated in the accompanying drawings of which v Figure 1 is a side elevation of a portion of a chainembodying my invention.

Fig. 2 is a plan view partly in section taken along the line IIII of. Fig. 1.

Fig. 3 is a transverse section taken along I the line III-III of Fig. 1.

Fig. 4 is a view similar to Fig. 1 showing a chain of alternative construction.

Fig. 5 is a plan view of one of the links shown in Fig. 4.

Fig. 6 is a lon 'tudinal section taken along the l1ne'VIV of Fig. 5.

Like numerals refer to similar parts in the several figures.

In the mining of coal, as commonly practised, kerfs are cut in the coal body to permit a sufiicient distortion of the material adjacent the said kerfs to dislodge fragments for transportation from the mine. The machines most commonly used for the formation of said kerfs are provided with cutting tools removably attached to suitable chains by the movement of which said tools' are forced into the coal to out it. 'Tools so used become dull requiring renewals which occasion interruption of the operation of the machine at more or less frequent intervals depending upon the character of the material being mined. I am aware that many devices have been proposed for attaching the cutter bits to mining machine chains which, while securely holding them in correct position during operation, will permit their quick and easy replacement and adjustment. Howeverv all such devices with which I am familiar possess certain inherent defects which it is the object of the present invention to overcome.

In Figs. 1, 2 and 3 of the drawings I have illustrated the preferred construction comprising a series of block links 1 connected by strap links 2 and pintles 3. The block links 1 are extended upwardly to form sock ets 4 adapted to hold the cutter bits 5in operative position in the manner well understood-in the mining machine, art. The cutter bits 5 are preferably straight pieces cut from steel bars of rectangular cross section, the cut ends of which are inclined to produce the cutting edge 6, at each end of the bit.

Patented Apr. 19, 1921. j

The bit 5 is longitudinally slidable in an aperture 7 of the socket 4 which is proportioned to form a snug sliding fit adapted to hold the bit against angular displacementwhile permitting its convenient longitudinal adjustment. Formed in one side of the socket 4 is a longitudinally extending elongated recess 8 communicating at its forward end with the aperture 7. In the recess 8 is mounted a dog 9 adapted to limited rotary movement in ,a horizontal plane about a pivot pin 10. Formed on the side of the cutter bit 5 is a plurality of. transverse notches 11 arranged in spaced apart parallelism, and adapted to be enga ed by corresponding teeth 12 formed on t e inner face of the dog 9. 'A compression spring 13 arranged to push outwardly upon the rearward end of the dog 9 holds the teeth 12 in engagement with the notches 11* thereby securely locking the bit 5 against movement longitudinally of the aperture 7.

I hen it is desired to remove or adjust the bit 5 external pressure upon the rearward end of the dog 9 will compress the spring 13 and rotate the dog 9 about'the pivot pin 10 to withdraw the teeth 12 from the notches 11 thereby releasing the bit.

its forward end with the transverse aper- .ture 7. Slidably mounted in the aperture 14 is aplunger 15 having a collar 16 against of said plunger while permitting its limited longitudinal movement. Formed on the edges'of the cutter bits 5 are corrugations 21 arranged. in' spaced parallelism and adapted to engagement by corresponding teeth 22 formed on the end of the plunger 15. When it is desired to remove or adjust the bit 5 the plunger 15 may be drawn rearwardly to disengage the teeth 22 from the corrugations 21 and release the bit. Afterv the bit has been adjusted to the desired position the release of the plunger permits the spring to push it forwardly to automatically lock the bit against movement longitudinally of the aperture 7.

at I claim iS 1. In a cutter chain for mining machines,

the combination with a block link having. a transversely extendingaperture, a cutter bit longitudinally movable in said aperture, a plurality of notches formed in the cutter bit, and a spring pressed member adapted to engage the notches to lock the cutter bit against longitudinal movement as and for the purpose set forth.

2. In a cutter chain for mining machines, the combination with a block link having a transversely extending aperture, a cutter bit longitudinally movable in said aperture, a plurality of notches formed in the cutter bit, a locking member adapted to engage said notches to prevent longitudinal movement of the cutter bit, and means to automatically move said locking member into locking position as and for the purpose set forth.

3. In a cutter chain for mining machines,

the combination with a block link having a transversely extending aperture, a cutter bit longitudinally movable in said aperture, a

plurality of transverse notches formed in the cutter bit, and automatically acting means cooperating with said notches to prevent longitudinal movement of the cutter bit as and for the purpose set forth.

In testimony whereof I aflix my signature.

CHARLES J. KIENZLE. 

